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Acta Agronomica Sinica ›› 2020, Vol. 46 ›› Issue (6): 809-818.doi: 10.3724/SP.J.1006.2020.91067

• CROP GENETICS & BREEDING·GERMPLASM RESOURCES·MOLECULAR GENETICS •     Next Articles

Functional characteristics of TaPYR1, an abscisic acid receptor family gene in mediating wheat tolerance to drought stress

HAN Le,DU Ping-Ping,XIAO Kai()   

  1. College of Agronomy, Hebei Agricultural University, Baoding 071001, Hebei, China
  • Received:2019-11-09 Accepted:2020-01-15 Online:2020-06-12 Published:2020-02-14
  • Contact: Kai XIAO E-mail:xiaokai@hebau.edu.cn
  • Supported by:
    Natural Science Foundation of China(31872869);National Key Research and Development Program of China(2017YFD0300902)

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Abstract:

ABA receptors are involved in the mediation of ABA signaling transduction through interaction with abscisic acid (ABA) molecules induced by osmotic stresses and play critical roles in regulating the drought stress tolerance in plants. In this study, TaPYR1, an ABA family gene in wheat that was shown to be differentially expressed in our previous transcriptome analysis was used to analyze its molecular property, expression patterns under drought stress condition, and functions in mediating plant adaptation to drought stress. TaPYR1 shares high similarities to its plant counterparts at amino acid level. TaPYR1 protein contains the conserved domains specified by the plant PYR proteins and was targeted onto the plasma membrane after endoplasmic reticulum (ER) assortment. The expression of TaPYR1 was induced in both roots and leaves under drought, with the highest expression levels at 48 h of drought treatment. Transgene analysis on TaPYR1 was performed to assess the gene function in mediating plant drought tolerance. Compared with wild type (WT), the tobacco lines overexpressing TaPYR1 enhanced growth vigor and increased fresh and dry weight under drought stress. In addition, the transgenic lines with TaPYR1 overexpression also increased photosynthetic function, enhanced activities of cellular antioxidant enzymes, and elevated the contents of osmolytes (i.e., proline and soluble sugar) under drought condition. Our investigation suggests that TaPYR1 transcriptively responds to drought stress signaling and plays an important role in regulating plant drought adaptation by improving the associated physiological processes.

Key words: Triticum aestivum, ABA receptor gene, expression, genetic transformation, functional characterization

Supplementary table 1

The specific primers for amplification of the NtSOD, NtCAT, and NtPOD family genes"

目的基因
Gene		 登录号
Accession number		 上游引物
Forward primer (5'-3')		 下游引物
Reverse primer (5'-3')
NtSOD1 KJ874395 GTGGACATGTCGTGTCAAGG TTCTCACCAACTCCTGCACTT
NtFeSOD KF724056 CATCACAGAGCTTATGTCGACA CTAGAACTGACTGCTTCCCA
NtSOD2 EU123521 ATGTCACGGGACCACATTAC AACCCTTCCACCAGCATTTC
NtMnSOD2 AB093097 GACGGACCTTAGCAACAGGG ACCAATGGGTCCTGATTAGCAG
NtCAT NTU07627 GTCTCAGGCTGACAAGTCTT ACGGAAGACAGAGTAGCAGC
NtCAT1 EF532799 CAAGGATCTCTACGACTCGATT CTTGAGGGCAAATAATCCACCT
NtCAT1;1 NTU93244 TCCTGCTAATGCTCCAAAGTGT AATGCATATGTATTAGGAATGCTC
NtCAT1;2 HF564632 GGTATCGACTTGGACCAAACTA GGTCTCACATTAAGCCTAGAAG
NtCAT1;3 HF564631 TTGCAGCCGGTGGGAAGATT GGTCTCACATTAAGCCTAGAAG
NtCAT3 HF564633 GTCTTGGGCCAAACTATCTGCA TCAGCTTCACATTGTGGGCC
NtPOD1;1 L02124 GGAATTTGTCCTCAAGGTGGAA CTTATTGGAATTGCCATTTCAGC
NtPOD1;2 AB044154 CTGACATGGTCTGTGCCTAC TCAGTTGATAGCAGAGCAAACTT
NtPOD1;3 AB044153 AAGATCTTGTCGCTCTTACTGG AATTGGATTTTCCAGCTTGCG
NtPOD1;4 D11396 TGCTGGTAGTCAAAGTCAGTTTT CCCATGTTGAACACGTTCTTACC
NtPOD1;5 AB178953 AACAGCAACAACGTTAACCCAGC TTAATTTTGGACCACATTCAGGA
NtPOD1;6 AB027753 TCAACTCCACTGGTGGCCCT AATTCGATTTTGCAGCTTGCGC
NtPOD1;7 AB027752 GCCCAAGAAGTTCAGGCTCA ATACAAATACAGTCCTTTACTCG
NtPOD2;1 AB178954 AGGGGAAAAGACCTCACCAC AGTTTCCCATCTTGATCATAGCA
NtPOD4 AY032675 AGACTCAAAGATAGCAAACCTCA CTTCCTGATGTCACCCTTGA
NtPOD9 AY032674 CACCACCTTCATTCAACGCTA ACATCTCAGACAAAACACTTGTC

Fig. 1

Molecular characteristics of the TaPYR1 protein A: TaPYR1 protein structure predicted; B: alignment results among TaPYR1 protein and its homolougous proteins; C: phylogenetic relations among TaPYR1 and its counterparts in plant species. "

Fig. 2

Expression patterns of TaPYR1 in both roots and leaves under drought stress 0 h, control before treatment; 6, 12, 24, and 48 hours, time points under drought treatment; R24 h and R48 h, time points of recovery treatment after drought treatment. "

Fig. 3

Growth characteristics of the transgenic plants under drought stress A: Plant growth characteristics of transgenic lines overexpressing TaPYR1 under drought stress; B: Plant biomass of transgenic lines overexpressing TaPYR1 under drought stress. WT, wild type; Sen 1 and Sen 2, lines overexpressing TaPYR1; Anti 1 and Anti 2, lines with TaPYR1 knockdown expression. Error bars indicate SE and symbol * represents significant difference relative to WT (P < 0.05). "

Fig. 4

Photosynthetic characteristic of transgenic lines under drought stress A: Photosynthetic rate (Pn); B: Intercellular CO2 concentration (Ci); C: Photochemical quenching absorption of chloroplast (NPQ); D: Photochemical efficiency of photo system II (ФPSII). Error bars indicate SE and symbol * represents significant difference relative to WT (P < 0.05). "

Fig. 5

Stomatal closure properties and water retention capacities of transgenic lines under drought stress A: stomatal closure characteristic; B: water retention capacity of leaves. "

Fig. 6

Activities of the cellular protection enzymes and osmolyte contents in transgenic lines under drought stress A: SOD activities; B: POD activities; C: CAT activities; D: MDA contents; E: proline contents; D: soluble sugar contents. Error bars indicate SE and symbol * represents significant difference relative to WT (P < 0.05). "

Fig. 7

Expression patterns of protective enzyme genes in transformed lines under drought stress A: SOD family genes; B: CAT family genes; C: POD family genes. Error bars indicate SE and symbol * represents significant difference relative to WT (P < 0.05). "

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